大角星移动星群：它在银河系中的位置
The Arcturus Moving Group: Its Place in the Galaxy
摘要：
大角星移动群是我们银河系厚盘内相空间子结构的一个很好的例子。传统上它被认为是一个溶解的疏散星团的残骸，最近有人认为它是银河系吸积的一颗卫星的残骸。为了研究大角星群的起源，我们对大角星群的成员和候选者进行了高分辨率的光谱丰度研究。检查134颗恒星的Fe，Mg，Ca，Ti，Cr，Ni，Zn，Ce，Nd，Sm和Gd的丰度，我们发现该组在化学上类似于盘星，并没有表现出明显的化学均匀性。此外，我们使用Nordstroem等人（2004），Schuster等人（2006）和RAVE（RAVE）调查（Steinmetz等人，2006）确认了大角星群的存在。这个群的起源仍然没有得到解决：化学结果与动力学起源一致，但并不完全排除合并的可能性。当然，大角星群对我们理解银河系厚盘的性质和起源提出了挑战。
英文摘要：
The Arcturus moving group is a well-populated example of phase space substructure within the thick disk of our Galaxy. Traditionally regarded as the remains of a dissolved open cluster, it has recently been suggested to be a remnant of a satellite accreted by our Galaxy. To investigate the origin of the group we undertook a high-resolution spectroscopic abundance study of Arcturus group members and candidates. Examining abundance of Fe, Mg, Ca, Ti, Cr, Ni, Zn, Ce, Nd, Sm and Gd for 134 stars we found that the group is chemically similar to disk stars and does not exhibit a clear chemical homogeneity. Furthermore, we confirm the existence of the Arcturus group using the Nordstroem et al. (2004), Schuster et al. (2006) and RAdial Velocity Experiment (RAVE) surveys (Steinmetz et al. 2006). The origin of the group still remains unresolved: the chemical results are consistent with a dynamical origin but do not entirely rule out a merger one. Certainly, the Arcturus group provides a challenge to our understanding of the nature and origin of the Galaxy's thick disk.
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